A set of example apps, mostly created to help me learn Racket.
asteroids-- a simple arcade game.
learn-music-- learn to read music with the guitar. Read more on my blog: http://ericclack.blogspot.co.uk/2015/12/learn-to-read-music-with-racket-scheme.html
learn-musicbut presents sequences of notes to practice.
stars-- experiments with very basic 3d graphics, including stars and aliens with random 3d paths.
Many of the app filenames have numbers, these indicate major changes -- so it's easy to look back at previous, simpler versions.